Need some guidance fellas. We have a 2010 210 with the 343. Went out surfing last evening. Filled up ballast and took off. On a run for maybe 2 minutes and I get code DTC 327: Knock1 Sensor Open or Not Present. Backed off and code went away. I got the same code every time about 2 minutes after hitting surf speed. I emptied the ballast and it ran perfect on the cruise back to the dock. Haven't had much time to surf this year due to vacations and kids sports etc, so this was the first run with full ballast. Been out several other times for cruises with no issues. Any suggestions??
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RPM and MAP need to be above a certain threshold value before you'll get this error. That explains why you're only seeing it when under load. Manual says to look for bad wire connections and/or replace the knock sensor. I'm dealing with same issue, but haven't found the culprit yet.
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